.main_app {
  width: 620px;
  height: 580px;
  font-size: 14px;
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  & > * {
    box-sizing: border-box;
  }
  a {
    text-decoration: none;
  }
}